Soraluzen egin diren tunelek hiru erabilera mota izan dute, historiaren hiru momentu desberdinetan eginak: trenbidearenak, urarenak eta autobidearenak.
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Urte batzuk geroago, 1910 hamarkadan, Txurrukenen parean zegoen trazadura zuzendu zituzten, eta horretarako Arkaitzeko tunela zabaldu zuten. Gaur egun oraindikmgordetzen da, baina seguritateagatik biertzetan itxita dago.
Eibar gero eta handiago egiten ari zela, ur hornidura bermatzea behar zen. Irtenbideren bat Sagar-errekako ura eraviltzea izan zen. Horrerarako presa bat egin zuten Sagar-errekan, eta tunelaren bidez ura Eibarra eruan.
Gutxi zelakoan, bigarren presa egin zuten leku bertan, aurrekoa baino handiagoa, eta tunel berria egin zituzten.
Gaur egun tunelak aprobetxatu izan dira Urkulutik datorren tutua bertatik pasatzeko.